That guy was shopping at the grocery store the other day and
tried to pay for his purchase with his ATM.  After swiping it
several times he told the cashier that he didn't think it was
working. The cashier told him that she didn't think anyone
had ever been able to get their driver's license to work in
the machine.

   So you think you're computer-illiterate?
   Check out the following excerpts from a Wall Street Journal article by
   Jim Carlton --
   Compaq is considering changing the command "Press Any Key" to "Press
   Return Key" because of the flood of calls asking where the "Any" key
   is. AST technical support had a caller complaining that her mouse was hard
   to control with the dust cover on. The cover turned out to be the
   plastic bag the mouse was packaged in.
   Another Compaq technician received a call from a man complaining that
   the system wouldn't read word processing files from his old diskettes.
   After trouble-shooting for magnets and heat failed to diagnose the
   problem, it was found that the customer labeled the diskettes then
   rolled them into the typewriter to type the labels.
   Another AST customer was asked to send a copy of her defective
   diskettes. A few days later a letter arrived from the customer along
   with Xeroxed copies of the floppies.
   A Dell technician advised his customer to put his troubled floppy back
   in the drive and close the door. The customer asked the tech to hold
   on, and was heard putting the phone down, getting up and crossing the
   room to close the door to his room.
   Another Dell customer called to say he couldn't get his computer to
   fax anything. After 40 minutes of trouble-shooting, the technician
   discovered the man was trying to fax a piece of paper by holding it in
   front of the monitor screen and hitting the "send" key.
   Another Dell customer needed help setting up a new program, so a Dell
   tech suggested he go to the local Egghead. "Yeah, I got me a couple of
   friends,"the customer replied. When told Egghead was a software store,
   the man said, "Oh, I thought you meant for me to find a couple of
   geeks."
   Yet another Dell customer called to complain that his keyboard no
   longer worked. He had cleaned it by filling up his tub with soap and
   water and soaking the keyboard for a day, then removing all the keys
   and washing them individually.
   A Dell technician received a call from a customer who was enraged
   because his computer had told him he was "bad and an invalid". The
   tech explained that the computer's "bad command" and "invalid" responses
   shouldn't be taken personally.
   An exasperated caller to Dell Computer Tech Support couldn't get her
   new Dell Computer to turn on. After ensuring the computer was plugged
   in, the technician asked her what happened when she pushed the power
   button. Her response, "I pushed and pushed on this foot pedal and
   nothing happens." The "foot pedal" turned out to be the computer's
   mouse.
   Another customer called Compaq tech support to say her brand-new
   computer wouldn't work. She said she unpacked the unit, plugged it in,
   and sat there for 20 minutes waiting for something to happen. When
   asked what happened when she pressed the power switch, she asked "What
   power switch?"

Some years back my live-in girlfriend (and now wife) came 
home while I was napping on the living room couch.  I was still 
half asleep when she leaned over me to try and get a kiss.  I 
wanted to say "don't get your hopes up" but then thought 
maybe "don't jump the gun" would be better.  In my half-awake 
state it came out "Don't get your guns up."